package com.mmall.util;

import lombok.extern.slf4j.Slf4j;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.annotate.JsonSerialize;
import org.codehaus.jackson.map.ser.impl.SimpleFilterProvider;
import org.codehaus.jackson.type.TypeReference;

@Slf4j
public class JsonMapper {

    private static ObjectMapper objectMapper = new ObjectMapper();


    static {
        //排除掉为空的字段
        objectMapper.disable(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES);
        objectMapper.configure(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS, false);
        objectMapper.setFilters(new SimpleFilterProvider().setFailOnUnknownId(false));
        objectMapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_EMPTY);
    }


    public static <T> String obj2String(T src) {

        if (src == null) {

            return null;

        }
        try {
            return src instanceof String ? (String) src : objectMapper.writeValueAsString(src);
        } catch (Exception e) {
            log.warn("parse object to String exception, error:{}", e);
            return null;
        }

    }


    public static <T> T string2Obj(String src, TypeReference<T> typeReference) {


        if (src == null || typeReference == null){

            return null;
        }
        try {
            return (T)(typeReference.getType().equals(String.class) ? src : objectMapper.readValue(src,typeReference));
        }catch (Exception e){

            log.warn("parse String to Object exception, String:{}, TypeReference<T>:{}, error:{}",src,typeReference.getType(),e);
            return null;
        }

    }
}